fix clamping of line and rect coordinates to avoid issues with cairo when drawing way outside a surface's dimensions; move various coordinate methods down to Canvas, because they don't require GTK information; make visible_area() a Canvas virtual method so that we don't have to cast to call it

1 files changed, 2 insertions, 2 deletions

diff --git a/gtk2_ardour/tempo_lines.h b/gtk2_ardour/tempo_lines.h
index defe07226c..a0c7650516 100644
--- a/gtk2_ardour/tempo_lines.h
+++ b/gtk2_ardour/tempo_lines.h
@@ -33,7 +33,7 @@ typedef boost::fast_pool_allocator<
 
 class TempoLines {
 public:
-	TempoLines(ArdourCanvas::GtkCanvasViewport& canvas, ArdourCanvas::Group* group, double screen_height);
+	TempoLines(ArdourCanvas::Canvas& canvas, ArdourCanvas::Group* group, double screen_height);
 
 	void tempo_map_changed();
 
@@ -48,7 +48,7 @@ private:
 	typedef std::map<double, ArdourCanvas::Line*, std::less<double>, MapAllocator> Lines;
 	Lines _lines;
 
-        ArdourCanvas::GtkCanvasViewport& _canvas_viewport;
+        ArdourCanvas::Canvas& _canvas;
 	ArdourCanvas::Group*  _group;
 	double                _clean_left;
 	double                _clean_right;